Valve construction



July 31, 1928.

H. E. THOMPSON VALVE CONSTRUCTION Filed Oct. 13, 1927 INVENTOR. 23 E. fiomps n BY ATTORNEY.

Patented July 31, 1928.

UNITED STATES OFFICE.

HARRY E. THOMPSON, F DETROIT, MICHIGAN, ASSIGNOR T0 UNIVERSAL COOLER CORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

VALVE CONSTRUCTION.

Application filed October 13, 1922. Serial No. 225,880.

This invention has to do with a valve construction, and more especially a valve construction in a piston useful in compressors for mechanical refrigerating devices and the like.

It is the object of the invention to provide a simplified construction which can be produced for low manufacturing cost and which will operate in an eflicient manner and which will require little or no attention after being once installed.

In thev accompanying drawings:

Fig. 1 is a side elevation of a piston which may be used with the valve construction.

Fig. 2 is a sectional view taken on line 2-2 of Fig. 1 showing the valve arrangement in the head of the piston.

Fig. 3 is a section on line 3-3 of Fig. 2 showing the valve arrangement at right angles to that in Fig. 2.

Fig. 4 is a plan view of the head of the piston showing the valve construction and the manner in which the head of the piston is constructed for receiving the valve assembly.

Fig. 5 is a perspective showing a part used in the valve arrangement.

A piston 1 may be of usual construction with an interior cavity 2. The head of the PM piston is provided with a port 3, preferably disposed centrally of the head. Around this port is a circumferentialgroove 4 spaced somewhat from the port. to leave a circumferential shoulder 5 for a bounding port. This circumferential shoulder 5 is reduced in height by suitable machining or grinding operation so as to underlie the surface of the head of the piston, as clearly shown in Figs. 2and 3.

The head of the piston is provided with a diametrically extending recess or slot 6, and on either side of the central portion of the piston it is counterbored and provided with internal screw threads.

A bridge member 7, which may advantageously be in the form of a stamping, is designed to be received in the recess 6, and is provided with apertures 8 for receiving screws 9 which fix the bridge member to the piston. The central portion of the bridge member is apertured, as at 10, and is provided with downwardly projecting lugs 11 Evhich may advantageously be three in num- The recessed portion 6 in the piston head is preferably of a depth substantially equal to the thickness of the bridge member 7 so that when the bridge member is in place it lies flush with the top of the piston. The shoulder 5, however, is spaced from the bridge member, and in this space is positioned a free floating disk valve 12. The projections 11 fit over and engage the outer periphery of the shoulder 5 and act as retainers and guides for this disk valve.

The operation of this valve construction is simple, especially inasmuch as quite a number of valves disposed in a piston have been heretofore proposed. In a compressor, upward movement of the piston forces the disk valve against the shoulder 5 and closes the port thus to compress gases above the piston; downward movement of the piston in a cylinder permits gases below the piston to raise the disk valve and pass into the chamber above the piston. The fact that the bridge member is apertured above the disk valve insures the closing of the valve on upward movement of the piston by reason of pressure exerted by the gases directly on the disk valve.

The invention is advantageous because of its simplicity; the machining operations in the piston are not difficult, and the disk valve, and the bridge member, may be made by stamping operations. Notwithstanding the simplicity and ease of manufacture, there being only two major parts in addition to the piston, an efficient valve construction is afforded. Due to the fact that the bridge member and the disk valve can be made of very light stock and used in conjunction with a much heavier piston, the operation of the valve is performed very quietly, and this feature is an especially de- 95 sired one in the compressing mechanism of a mechanical refrigerating unit.

Claims:

1. A valve construction comprising a piston having a port in its head, a shoulder .100 bounding the port, a bridge member fixed to the piston and spaced from the shoulder, a disk valve operating between the shoulder and the bridge member, and means bridging the gap between the shoulder and the bridge 1 member for retaining and guiding the valve.

. 2. A valve construction comprising a piston having a port in its head, a shoulder bounding the port, a bridge member fixed to the piston and spaced from the shoulder, a

disk valve operatin between the shoulder and the bridge mem er, and projections on the bridge member extending toward and beyond the top of the said shoulder for retaining and guiding the valve.

3. A valve construction comprising a piston having a port in its head, a circumferential shoulder bounding the port which lies in a plane below the plane of the piston head, a bridge member extending across the port and spaced from the circumferential shoulder, and a disk valve positioned between the shoulder and the bridge member, and means on the bridge member extending toward the shoulder for retaining and guiding the valve.

4. A valve construction, comprising a piston having a port in its head, and a circumferential groove around the port, a shoulder between the port and the groove, a bridge member extending across the port and groove, a disk valve positioned between the shoulder and the bridge member, and projections on the bridge member extending into the groove and fitting relatively close to the shoulder for holding and guiding the disk valve.

5. A valve construction, comprising a piston having a port in its head, a circumferential shoulder bounding the port, said piston having a circumferential groove around the shoulder, a bridge member extending across the head of the piston and rovided with an aperture in alignment witli the port, said bridge member being spaced from the shoulder, a disk valve operating between the shoulder and the bridge member, and projections on the bridge member which fit into the groove for holding and guiding the disk valve.

6. A valve construction comprising a piston having a port in its head, the head of the piston being provided with a circumferen tial groove around the port, a circumferential shoulder bounding the port, said shoulder lying below the plane of the piston head, the said piston bein also provided with a diametrically extending recess, a bridge member disposed in this recess and having a thickness substantially the same as the depth of the recess and being provided with a central aperture in alignment with the port, said bridge member and the shoulder which bounds the port being spaced from each other, a disk valve positioned to operate between the shoulder and the bridge member, and projections on the bridge member which extend into the groove, and which lie in close proximity to the outer edge of the circumferential shoulder for holding and guiding the disk valve.

In testimony whereof I atiix my signature.

HARRY E. THOMPSON. 

